Removing Mud stains on Galvanised chassis

I've had a bit of success by mixing a concentrated brew of truck wash.
Mix in a cheap garden pressure sprayer, spray on and leave. Doesn't matter if it dries. Then pressure wash off.

https://www.bunnings.com.au/chemtech-1l-rust-off-remover_p1107356

It is an acid based cleaner but works

If it's WA red iron oxide stains I use aluminium cleaner from the auto shop. Also good for cleaning nuggets. :)
Dave.

Greendog
Have you tried Vinegar? ie ACETIC ACID ! It removes calcium scale and other natural scale from surfaces and might work ok on the stain associated with earth staining.

I wouldn’t be using anything acidic. Maybe some truck wash and a pressure hose. Red oxide stains are OK.
Cheers
Jim

Chemtech CT18 Superwash Truck Wash

This one is ph neutral ….. so they say .

Cheers
Jim

As well as Chemtech CT-18, (DON’T leave it on any gloss surfaces for more than 1 hr!) there’s these other 2 products that have good reviews.



Available at the big green shed. My BIL swears by it!



Bought mine from local hardware, also available online. And anyone that has bore water scale on their windscreen, get some FINE or SUPERFINE steel wool from your hardware or the BGS.

Bob