The drain pipe that my washer drains into overflows or the water backs up into my garage
The line seems to be clear but not sure if it really is and the gas I saw so I think that was coming from the drain pipe which looks awfully small to me was disturbing can you help to fix this problem. My neighbor said they just had a problem too with their bathroom drains and we just had one of those which is OK now but the washer drain is the problem still

Are you on a septic system or city sewer? If on a sewer you need to snake the drain line downstream from the washer and if on a septic system I would have the tank checked to see if if needs to be pumped. Good luck, Tom