PLURALS

I find it amazing that so many companies who are in specific businesses don't even know the nomenclature of their own business. I keep seeing a commercial for a company called Leaf Filter  who specialize in cleaning roofs, gutters, etc. But they obviously think that the plural of roofs is rooves, which it isn't and hasn't been for decades. Note: I am forced to express annoyances like this on my blog since I don't have the luxury of Twitter any longer.