Is what the questioner used to do — washing and wiping everything he touched after masturbating due to purity-related waswas — considered correct, and are some of the things he touched still impure?

Praise be to Allah, who enabled you to repent from this evil deed. Then, know that obsessive whispers (waswas) are among the worst ailments that corrupt both religion and worldly life. Their optimal treatment is to turn away from them, ignore them, and pay no attention to them. What you were doing previously was incorrect, for the default is the purity of places about which you doubt their impurity, and semen is pure according to the preponderant opinion. There is no reason for this doubt and obsessive whispering. You must ignore these whispers, cast them away, and pay no attention to them.