I recently bought a 1986 Mirage which was very neglected by her previous owner. The swim platform was the first thing to go. It needed new brackets and a good sanding and varnish. Anyways, there was a bed of nasty silicone under the brackets. I found that a rubber bar used to clean sanding belts works great. It's like an eraser but on a much bigger scale. I hope this helps anyone faced with similar dilemas. By the way, I love this forum. It's the first place I look when I encounter a boating challenge. Thanks you guys.
-Angie -Anacortes,WA
-Angie -Anacortes,WA