Protecting Equipment from Children

My grandson stuck Play Doh into the rear port of a speaker and ran off.  Only his three year old hand/wrist could fit into the port and he wasn’t interested in retrieving it.  On the other hand, the Pay Doh was revelatory, as if a veil had been lifted, and I now recommend it to everyone as a tweak

I can't get angry at the grandkids.  After all, we have a common enemy, their parents