I was flipping a lot of gassers last summer and cleaning the plastic tables was high on the priority list. Here's what I found wooked really well. You'll need a container large enough to soak the table in. I have a big Rubbermaid tote that works fine. Fill the container with water (hot is best, but cold garden hose water also worked) and a healthy dose of Dawn dishwashing detergent. Now, the hard part. Nothing. Let it soak overnight. The following day, use whatever scrubbie you like and it'll clean up like new. This method hasn't failed me yet.