I have a question regarding strange plumbing backup involving my washing machine and adjacent bathroom. When the washing machine or bathroom tub drains water, the toilet and sink in the same bathroom gurgle. Occasionally, soapy foam from the washing machine backs up into the toilet. If you flush the toilet while the washing machine is draining, the toilet nearly overflows. The washing machine drain outlet has never overflowed. My husband wants to try draino on all the pipes - I want to hire a plumber to figure out the problem. Is draino safe? Helpful? Should he snake the pipes? Or should we just hire a plumber? Any advice or suggestions would be greatly appreciated!