We just brought our "new to us" 1994 2720 home last week. In the cleaning process we have found that the "Mr Clean Erasers" work great to take black marks off the walls inside and the outside also.
Doesn't hurt a thing and the marks come off with little if any effort.
We also used "Mean Green" cleaner on spots on the upholstery and carpet .
Did a great job of taking out old set in stains.
Also used it to clean up the vinyl strips that velcro down to cover the seals and also on dirt on the velcro.
Left our TM looking great.