My 1987 C30 has very recently developed rust on both the sink and the stove. The boat spent the first 20 years on Lake Michigan(low humidty winters) and is now on Lake Texoma ( very wet winter and spring this year) as of Nov. 06. I have used several products to remove the rust, but it keeps coming back and is worse each time.So I need to know of a better cleaner and if there is a sealer of some kind that prevent the reaccurance.Help!