Hey guys, just wondering exactly if it would be wise to clean the foam of my air filter.. or should I just replace it? It is one of the internal kind (I attached a pic) and I was wondering if it is okay to clean the foam on these ones. Because I have seen before online that they recommend you do not clean the internal foam, only the external (which I don't have). If I have to get new foam, I mine as well get a new filter.. would this be wise anyway?