From: John De Armond Newsgroups: rec.outdoors.rv-travel Subject: Re: Acid wash my new baby? Date: Sat, 13 Oct 2001 17:01:43 -0400 Jennifer wrote: > > as noted in another post "I did it", I purchased a 78 Tioga. Someone has > recommended taking her to the local truck wash for an acid bath. I thought > those were only for aluminum trailers and such. however, he said he did his > pickup and it does look great. > I wouldn't do that. The acid is a bit harsh for RV metal and it isn't necessary. The strongest cleaner that you're likely to need is the Purple Power-type liquid degreaser sold by car parts stores and lots of other places. It contains strong detergents and lye. It will remove almost anything including wax and surface oxidization. Because the lye will etch exposed aluminum if allowed to remain in contact, it must be washed off THOROUGHLY and then any painted surface immediately waxed. Unwaxed paint will oxidize in literally days after this sort of cleaning. John
From: John De Armond Newsgroups: rec.outdoors.rv-travel Subject: Re: Paying to have the RV washed? Message-ID: <email@example.com> Date: Mon, 11 Mar 2002 19:19:44 -0500 On Sat, 9 Mar 2002 18:11:57 -0800, "ben hogland" <firstname.lastname@example.org> wrote: >> And you don't think Soft Scrub with chlorine bleach will damage the finish? > >I agree and will ask the person<s> that wash my RV to use Simple Green ahead of >time.. If they frown on that, I won't let them wash it. > >Thanks for the info, Janet. In this case, the advice is worth just about what you paid for it - nothing. Bleach, in the concentration used for this sort of washing, will NOT harm the RV's finish. dishwasher detergent is some of the strongest detergent available to the consumer. It probably won't hurt the RV (but who knows without looking under trim strips and such where it can get trapped and corrode the aluminum.) but it damn sure will remove the wax. Wax and food grease is similar enough that the only way of knowing that the wax is safe is to use a known compatible cleaner. The advice about Meguires was excellent. Most any car wash ought to be OK. If you have black streaks, you're going to have to use something fairly strong, once the wax has oxidized and the black gets a good bite. I use the very strong Purple Stuff alkaline degreaser. I know that it strips wax (including the black stained wax) and I also know that it is corrosive to aluminum so I limit the exposure. I follow the cleaning with multiple rinses and then a good wax job. Meguires seems to last the longest. If you wax often, several times a summer, the black streaks will wash right off with car soap. If you don't (I never seem to) and the wax oxidizes again, you're going to have to strip it and rewax. BTW, I'd jump on $2 a foot in a heartbeat. I've been paying that much to street bums who happen along and I have to stay right with them to make sure they do what I want. John
From: John De Armond Newsgroups: rec.outdoors.rv-travel Subject: Re: Cleaning AC Coils ?? Message-ID: <email@example.com> Date: Mon, 11 Aug 2003 22:24:34 -0400 Depends on which flavor of cleaner you like. There are both acid and basic coil cleaners. The acid ones usually contain phosphoric acid. The basic ones sodium hydroxide. Generally the acid cleaner is used with aluminum coils and the basic one used on copper or brass. I don't see any problem with using the acid cleaner on an RV as long as lots of water is used to wash it off. Phosphoric acid doesn't do much of anything to anodized or painted aluminum. It might streak paint if left in contact for some period of time. When I clean my unit I first wet down the whole rig and flood the roof. The cleaner only needs to be in contact for a minute or two so I spray it on and immediately start flooding the area around the AC with water. A few minutes later I blast the coils with a pressure washer, then use the washer to sweep all loose liquid off the roof. I routinely use Purple Stuff which is very alkaline to clean my rig. It does a fine job of stripping wax (and black streaks) plus paint oxidization. Gets the rig as-new clean, followed immediately with a waxing. No staining on the aluminum. Considering how many years I've done this I'd expect stains to show by now if they were going to. As usual, YMMV. John On Sun, 10 Aug 2003 16:23:37 GMT, Chris Bryant <firstname.lastname@example.org> wrote: >On Sun, 10 Aug 2003 16:02:23 +0000, Lee Bray wrote: > >> I noticed that recommendations for cleaning coils did not include coil >> cleaner itself, is there a reason for that like rubber roofs or what? I >> mean Fantastic or Formula 49 or whatever was recommended. Just curious why >> the product designed to clean them was not put up. Also a tank sprayer >> would make the job somewhat easier to spray the coil cleaner (Home Depot) >> and keep it off everything, plus you could use it to spray water in there to >> wash it down. I use it to do household AC's so that is the reason for my >> questions. > > The main reason is that most coil cleaners (though not all) >contain materials that shouldn't really be running down the side of an RV- >I *think* a lot of them contain phosphoric acid- though there are more >and more non-acidic cleaners out there. Raelly, the coil cleaners are made >to clean the coils and then run right out the drain- not over aluminum, >rubber or fiberglass- though some might be OK.