What can i use to clean and clear coat metal roof?

my metal roof is dirty and the snow dont slide as good, what can i do?What can i use to clean and clear coat metal roof?
You need to specify the material more clearly in order to get an accurate answer.





If you have a Kynar-finish, or similar roof, the best option is to power-wash it and leave it at that. Most paints and other coatings will not adhere well to Kynar finishes and will peel off over time. Most Kynar-type finishes are guaranteed for 20 years, or more depending on the substrate (steel or aluminum).





If it is an older painted metal roof, either galvanized or (very old) tin-plated, and still intact, your best bet is to again, power-wash it and then repaint it with a compatible paint. There are any number of metal roof paints designed for that purpose in any of several colors.





NOTES:





a) Older roofs may have residual lead-based paints on them - ';red-lead'; paint was very commonly used as a roofing paint through the 1970s - and why you see a lot of rusty-red colored roofs. If you power-wash a roof of this nature, a large amount of lead will be released into the ground where the roof drains. To the extent possible, put impervious drop-cloths at the drain areas to catch this material. If it does get into the ground remember that fruits and vegetables grown in that area may take up some of the lead - point being: get the paint tested for lead content if you think it is more than about 25 years old, or so.





b) There are any number of silicon sprays and clear roof coatings on the market, pretty much all of them temporary and pretty much all of them useless after the first winter. Don't waste your money. If your roof has the proper pitch and the metal was installed correctly, you have no worries anyway. Further to that, some of the ';slick'; sprays are fairly toxic.