When asking a question, it is generally helpful to provide as much information as possible. The make and model of boat at a minimum would be suggested. In the case of your question, whether the boat was stored in water or on a trailer and what it is made of would also be very helpful.
If the boat was normally stored on a trailer, it may not have had an antifouling bottom paint applied. None of the antifouling paints on the market that I know of are "silver" in color, though some may be grey.
When you washed the boat, was it a pressure washer or just a hose. If it was just a hose, I doubt it was a bottom paint of any sort, or the prep job the previous painter did was truly pathetic.
Most anti-fouling bottom paints I know of, excepting the ablatives, will generally not come off with even a pressure sprayer, unless you are intentionally trying to remove the paint provided the surface preparation was done properly. Some of the hard epoxy-based paints won't come off to a pressure sprayer at all.
Would also recommend you read the OP of the thread located HERE,
as it will help you get the most out of sailnet.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.