Hi formila6,
Can you please explain the following:
When the extraction process has finished, simply apply Hydrogen Peroxide (6 or 7%), leave for a few minutes and then blow dry off. 9 times out of 10 it will disappear. This is the safest, effective and cheapest way

What is and where do you get hydrogen peroxide, sorry for sounding stupid but I've never heard of this before....
Kind regards,
Jason.