Join Date: Feb 2009
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I'd rent or borrow a power sprayer if you can get any kind of access through the trailer, which sounds like the case. It'll make quick work of that stuff. You can get the spots that the trailer is sitting on by taking a quick swim with a brush once its in the water.
The caustic stuff (On&Off) works great both above and below waterline too but if you end up going that route, heed the warnings about eye/skin contact.