Leaking cast iron waste pipe
First, my thanks to those who answered my last question. I epoxied the pipe and covered it with mastik. Still a few small drips but I think another coat will fix the problems.
Sink drains fine, tub drains fine, toilet is the one that causes the drips. My thinking is that the waste pipe has a partial clog. I've been here for over 20 years, lots of daughters who generate lots of hair etc. I've had the main roto-rootered a few times over the years but this one is off on a separate line.
Because of the patches I don't think roto-rooter is an option. There is a clean-out cap right at the end of the horizontal pipe and if I could get that open I'd probably be able to flush it out myself. But the cap is on tight - can't budge it with a monkey wrench.
Any ideas on how to loosen the cap?