Re: Keeping small critters out
We have both a boat nad an RV. What we use is mothballs around the outside fo the RV and Irish Spring soap inside. In almost 15yrs thre only mouse we had was the first year, before we started using combination of the 2. Also consider using something in all the holes that varmints can get into.
In our RV we use steel wool anywhere that plumbing holes are, around the vents we use steel window screen. For boats the drain hole is good way for critters to enter. Put the plug in but leave it loose enough for water to drip out. (Don't forget in the spring). Keep it away from trees or long grass, they are both great ways from squirrels to get in. They make mice look like house pets with the mess they make. Other than that agood tight cover works good. If your cover has ways to get in they will. Consider shrink wrapping?