Both my kitchen sink and washing machine drain are backing up. Thursday night the kitchen sink started draining slow and it started backing up out the washing machine drain in my laundry room. I used baking soda, vinegar, and boiling water in the sink and it seemed everything was back to normal until I started my Saturday morning laundry and the drain water first starting backing up into my kitchen sink then back out the washers drain pipe.

I'm not positive where to begin, but due to finances I really have to fix this myself otherwise I won't be able to afford to call in a plumber till after New Years.

I'm planning at this point to the sewer clean out even though its currently raining cats and dogs and to go to Home depot and buy a snake.

All a help/suggestions will be greatly appreciated.

*** Since writing the above I went to Home... and purchased a 20' snake and snaked both the sink and the washer drain pipe and that has not changed anything. I have a dual kitchen sink the side that opposite the disposal backs up when the disposal is turned on. When the washer discharges water it backs up on the side opposite the disposal first then it begins backing out the washer drain pipe.

" 20' snake and snaked both the sink and the washer drain pipe and that has not changed anything." this tells me your clog is further down than 20". Are there clean outs along your main drain line possibly in the basement or crawl?