sticky problem

[rob m]

When im spraying my body shells i always have the problem of sticky left behind from the window masks and tape i use to mask my design
What i want to know is what do people use to remove this without affecting the lexen or damage to the paint and still able to spray paint the area that has just been cleaned from the sticky left behind?
What i use for my masking is the same as the window masks that come with the bodys.