|
For pulling up the oil stains, try looking for poultices designed to pull them out of cement garage floors. Various powders that you mix up, set on the stain, and they draw it out of the floor. I'd guess that's going to be your best bet on the deck, since the oil has now migrated into or past the gelcoat--and simple scrubbing is just going to erode the gelcoat further.
The butyl tape stains should come up with solvent, unless they also have migrated down into a very porous deck. In that case...might be time for doing the best you can, and then (ugh) asking the "coating" companies how well you can recoat & reseal the deck over them.
They get insulted if you say "paint" these days.
|