I have a 10 year old RCA 50 inch big screen TV with marks on the screen that seem to be on the inside. How do I clean the inside of the screen, thanx Lon

Marks inside the tv glass should only be cleaned by a professional because you may damage the extremely sensitive parts of the television, if its not to bothersome to you , you should ignore it as you will probably be charged an arm and a leg for this,(i know from experience)

you can also try adjusting the picture settings until it becomes less noticeable

If you need further help, I’m available over the phone at https://www.6ya.com/expert/sebastian_77d678f854ac506c