A few months ago I found that I had water spots on some of the fiberglass but only in a few areas which didn’t make any sense to me.
Nevertheless I tried a cleaner wax that has always been successful for me but that failed. I tried using a vinegar water solution and that failed. Next I tried a gentle polishing compound and that also failed.
Somewhat reluctantly I ordered Meguiar's Water Spot Remover and much to my surprise it worked like magic. I then used a marine-grade wax that has proven to be long-lasting and now those areas look good as new.
Amazon.com : meguiar's water spot remover (https://www.amazon.com/s?k=meguiar%27s+water+spot+remover)
I thought this information might be helpful to anyone with the same water spot issue.
I use a 30% vinegar solution to soften water spots, the same vinegar solution I use to kill weeds.
Amazon.com : Harris 30% Extra Strength Concentrated Vinegar for Home... (https://www.amazon.com/Harris-Vinegar-Strength-Trigger-Included/dp/B07MJCNWGR/ref=sr_1_7?dib=eyJ2IjoiMSJ9.EsAw5pNKbTvxDIHnstWgdK-i9PMivTJCMYi1iI3EAuhkB1P-zLsZ7RWHXkfZpBDoMlxptGo_6Y1liHdTwt1ERx_TTXqGdJNSu8DX75RS7k2PxYeClFnX6X7zyCJRWpHqMeNF30MAzmMlpSABkQx7Jl-oj1o7fb6Fu1F20TqUJSm2vT_TVZPYXiTFMpBUoR_lLjVvDAddYCc1G8rT5jQLqQ2EUxvoZYtno6u01kkRKX4DtmhJ-2DGEdaKfwrs4pOIbY2oxfQ1j4p-1wgrIiAISaLCH-G2JTwccKw5SpJfQko.E9CeGhnUTtf4z8MfwICwt8_ZxyNa36_S-SGrV2V1Moc&dib_tag=se&keywords=30%25%2Bvinegar&qid=1768597344&sr=8-7&th=1)
Larry