Not as bad as poking speakers, but when my Daughter was about 3 years old, she found her big Sister's lipstick and drew all over my Polk 5b's, It was about 6 years ago I found a product that would lipstick from speaker cloth. https://www.lowes.ca/automotive-detailing/armor-all-orange-cleaning-wipes-25-wipes-_12592459.html?af=3632&cse=3632&gclid=Cj0KEQiAlO20BRCcieCSncPlqqMBEiQAOZGMnEYATC4tN930D-TmyEcpWOFYDecx28lMVSxv8eIlyTcaAnaC8P8HAQ&gclsrc=aw.ds
Had never thought of trying this on the grill clothe, took it all out can't even tell that there ever was lipstick on those speaker grills.