I haven't really had a lot of time to look, though. The main drain in the laundry room backed up right when we (all right, I mean my wife) needed to do six loads of laundry. Well, part of that need was created by the back up soaking all the clothes on the laundry room floor. So, after we got tired of vacuuming up the water and lugging the bucket around to the shower drain, we jury-rigged a hose directly from the washer to the shower drain. Somebody still had to watch to make sure that didn't overflow - it hasn't, except when I covered the drain with 'Liina's tub when I was giving her her bath last night and the washer started draining just as she finished. I didn't know it was running because I had the dehumidifier and the ceiling fan running to help the rug dry out from the first flood.
Anyway, I went to Menard's to see what they had to unclog it. Being kind of a Tim Allenish sort of guy, I bought the strongest thing they have: concentrated sulfuric acid.
I have a recommendation: use something else to unclog your drain.
No, I used the stuff carefully and conscientiously, but the whole house smells like a giant pig took a dump in it. And it's still too early to check and see if it worked or not.