Ants have taken over my boat. I''ve sprayed, scrubbed, set traps and done everything I can think of to get rid of them. I don''t keep any food on the boat, so I can''t even figure out what they''re after. They''re the relatively harmess little ants, but they''re really plucking my nerves. I think they''re coming across the dock line, but spraying that isn''t helping. Any ideas?