Customer called us out for a clogged sink and washer box. I tested the sink and it backed up after an about a minute. I checked in the crawl space and found a large belly in the line from the washer box. I also found a small puddle of water under the master bathroom toilet. I let customer know and they wanted to take care of it themselves. For the clog I recommended running a flex shaft down the washer box. Customer agreed. I ran the machine and successfully cleared the blockage. I ran water for 20-25 minutes with no issues. I cleaned up throughly.