A member of my household thought our garbage disposal was a magic ray gun that obliterated anything poured down its black hole. The plumber cleared a glue-like substance from the pipes underneath the sink with a screwdriver but his auger barely penetrated 5 inches into the main wall pipe that leads to the sewer. I cannot afford to have my pipes cut out and new ones installed so I was just going to use the sink in the basement to clean dishes.
So which is the better option so sewage fumes do not overrun my house:
Easy option: Cap off the sink hole & garbage disposal.
Remove all the pipes under sink & garbage disposal and cap off main pipe at wall.
Leave the P-Trap and cap the pipe off after that.