Also, a little trick I do once a month or so is put a pan of water on the stove and while it is getting up to boiling, take some baking soda, put it down the drain, then take a cup of vinegar, after heating it up in the MW for a minute, and pour it down the drain!
That will clean out most of the crap, and when you get the pot of hot water boiling on the stove, pour it down, to rinse everything down! That is very easy maintenance, and keeps our drains clean and running good, here at home and in the MH also! Rail!
Retired, and "Always on Holiday!"
1996 Monaco Windsor 38PB, "Mona" 275 HP., 8.3 Cummins, 3060 Allison 6 speed, 2001 PT Cruiser, "Bailey"