Dry Erase Marker on Plastic

At my daughter's last birthday party I allowed her guests to write on plastic patio cups and plates I have.  It helped us stay in our birthday budget, and provided way more entertainment than I'd anticipated.

The predicament arose the next day, when I removed them from the dishwasher and realized the marks weren't coming off, as they do on plastic containers I use.  

I tried several different cleaners with no luck, until finally, I found a solution that worked.

Wouldn't you know plain old rubbing alcohol did the trick?  Alcohol is the reason hand sanitizer cleans windows and dry-erase boards.  My hand sanitizer didn't contain enough alcohol in it for these cups, but alcohol sure did the trick.

I'm so excited to add this new weapon to my cleaning arsenal!