I ues a product called Mean Green, it works great!!!Sometimes it takes a bit of work with a small pot brush.You can get it at walmart, once they are clean I use the seal treatment that you can buy at any RV store.
WD-40 is the non-heart attack method. I've tried all the other dollar store cleaners with good result but a lot of elbow grease. For some reason the WD-40 melts it away and then I follow up with a good protector like 303.
2013 Jayco Eagle 334RBTS
Crossroads Forum Lurker