@Zor_Lence
Duodeluex has been around forklift trucks a while and has been to more than 3 county fairs and a couple of goat roping contests,
He just looking for new "tricks".
Never PW an engine compartment - just used water hose pressure sprayed the compartment with spray de-greaser, sprayed distributor and wires with WD - (WD = Water Dis-placer) and for a "belt and suspenders" approach stretched one of those rubber gloves that the Dr. uses for a prostrate check over the distributor or Walmart bag and a twisty and avoided direct pressure on the cap area.
Realize that PW is required for operations in gypsum operation/ dry wall manufacturing, fish/meat processing, glue making, cotton bale handling, etc due to the vacuuming effect of a forklift.
One more thing that has nothing to do with forklifts but for cleaning mold & mildew off your your house siding. I no longer pressure wash my siding. I go to Home Depot to get all the stuff you need. - I gallon of of JoMax (cleaner dirt off and has mildew killer to) about 20 bucks, two gallons of oxygen Clorox (about 10 bucks ea) and on Windex Outdoor Window Cleaner (9 busks) You are after the the bottle spray that has an Off, Clean and Rinse position. This sprayer will reach about 25' in the air or higher if you are taller than 5'7'" (me) while standing flat footed on the ground..
Empty the Windex into a milk bottle - you can use it after your a through cleaning. Pour about 1.5" to 2" of JoMax in the bottle, then fill the bottle with the Oxygen Clorox (HD has a store brand). Hook it to a hose. I spray my siding first with water first (rinse position), then start at the top in the Clean position start cleaning let sit for about 5 -10 minutes then rinse - don't let it get dry before you rinse. Takes me about 2.5 hour to do my house - and I have a covered wrap around porch ceiling that need treatment). It runs across the front and complete side depth).
No ladders, faster time , no gasoline to burn. I've done this for the last 15 years about every 2 years. - I just watch the north side of the house for that green mold to show up..
One more thing it works great on cleaning the the flat stone work I have on the house front and on the stacked stone work on each side of my driveway that bridges the drainage culvert.

You need to be very careful during the process and not do this if you don't know how. So, if you are not a professional, then think twice before cleaning this thing yourself.

Turn off the vehicle and spray the spark plug wires and the inside and outside of your distributor cap with WD-40. Start the car back up to see if that did the trick. Using WD-40 to repel water from spark plugs, distributors, alternators, and batteries is a good way to prevent corrosion and keep moisture away. Check our website www dot spotlessmobilewashinc dot com for more info.

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i wouldnt go pressure washing any modern forklifts
including IC trucks
ive had problems where the customer pressure washed the engine and moisture was blasted past the weather proof connections for the ECM and injectors and caused all kinds of problems

in fact i discourage washing anything with electrical in it (including old IC trucks) a lil moisture and corrosion can go a long way to cause big harness headaches

i had a customer who washed his linde e16-02 (324) and it came up with a code 42 which is a bad power unit or moisture in the drive motors

the customer thought i was nuts when i told him to let it sit for a week to dry completely (after testing the power unit and associated wiring and it all came back good)
10 days later it was up and running and went months b4 it had even a minor breakdown (he got really lucky in other words but then again that was a low pressure wash)

electrics out in the rain drives me nuts too
a good analogy to make is to tell the customer who insists on driving an indoor machine outdoors in bad weather "take your brand new flatscreen HDTV and watch it out in the rain, how long do you think itll last?" most get it after that

Amen Ed

and even (if you are me and) you do wash electric trucks, avoiding motors and chopper and contactor panels, NEVER do it in front of a customer, they will surely think they can do it too, and you will have to sell a bunch of parts then...

cover the cap with a ziplock bag and zip tie it. When done remove cap and dry out with air hose..usually works for us.

Hi, I don't have the sollution for the battery problem, but for the contact set issue, you can use an Pertronix "Ignitor" elctronic ignition. This will greatly reduce the "wet problems" you will have. You can find the Pertronix dealers on their website www.pertronix.com

Shop vac works well on electric trucks to get the most off then blow with air.When we have to wash electric trucks we let them sit for a few days then blow them out before plugging them in.Dont like to wash them at all if I can help it.WD 40 works well on dist caps

I learned from an older tech when i started. Gas trucks are a given that you will have to spray out the distributor cap with contact cleaner. Ensure that you don't directly spray the dash area (ECM's etc are normally mounted there). Blow dry well. The cleaner truck runs better and it's easier to find those little seeps and leaks that seem to exist on the older units as they age.
Electric trucks are different.
There are a couple of wasy I've seen. i prefer the 'safest'. Unplug battery and remove (to clean under). Wash the heck out of it (it'll get the mud out), blow down and then park for three days to drip dry before you even think of plugging in a card. I've seen of rebuild shop pull all cards before washing to ensure that there are no issues..

I agree that you should never pressure wash electric trucks. The only possible exception to this is carefully washing the mast.
As for the water in the distributor problem, just take the cap off and blow it dry with compressed air. Works every time.

Never pressure wash Electric trucks, remove battery and wash separately and let it fully dry before fitting it back and for the rest of the truck use Compressed air to blow out the dust with a suitable mask to protect against the dust

Spray wurth contact spray inside and outside of the Distributor cap and forget about the problem