How to Effectively Use a Bleach Gel Pen for Stain Removal Posted by Iye on March 28, 2025March 28, 2025 in School & office supplies What is a Bleach Gel Pen? A bleach gel pen is a targeted stain remover. It contains a thick bleach-based gel. This gel is housed in a pen-like container with a narrow tip. The design lets you apply the gel…