Upstairs tubs backed up
We are renting a house that was built in the 1930s. Both tubs upstairs are draining very slowly. Also, when we take a shower in one, the other tub fills up with water and then drains. We've had a plumber come out to look at it, and he cleaned the trap (he didn't tell us where it was). It did work for a little bit, but after a month was doing the same thing. My husband and I are not handy, and the only thing we can think is the trap is a little compartment beside the tub, behind the toilet. It does have some pipes in there, and we've tried to stick a snake down there. No luck! We would love to save some money and fix it ourselves, but we're tired of trying. Can you give us any suggestions?