Does money earned from a previous job involving selling immoral songs and helping young men engage in inappropriate conversations with girls make wearing clothes bought with this money dubious, and must one remove these clothes when performing a lawful job to purify the money?

Money earned from a permissible job is not suspicious simply because clothes bought with haram money were worn. Halal money remains halal. The money you earned from your work in the computer shop is haram if the devices were used for things forbidden by Islamic law. You must repent to Allah, and refer to Fatwas no. 63991 and 79345 to learn the ruling on disposing of money earned from that work.