Lingering Water Spots

I normally wipe down the boat after every use, but sometimes last year we let the boat air dry. Now there are a couple of small places on the color parts of the hull with lingering water sports that aren't coming off with just soap, a brush, and water.

Any thoughts on the best things to use to get them off before I wax the boat? We normally use 50-50 vinegar and water or Eagle 1 Wipe and Shine to get spots off, but those aren't working on these.

Thanks.