What are the best solutions and technics to clean boomboxes without scratching or damaging them??

Dawn Dish washing liquid and Patience & TLC

microfibrecloth, qtips, toothpics, toothbrush,...

I use all the methods above on not just boomboxes and find they do the job.

Ive also used a paste stuff intended for use on your face to clean pores and prevent spots and that gets rid of ground in dirt quite well without damaging the surface of what I used it on.

My own tip. First time i have divulged this, is stardrops, all round cleaner. brilliant