Guide to Erasing Toe, Foot, and Heel Marks from Sandal Insoles
Initially, ensure to test the cleaner on a discrete area of your sandal insoles to prevent any unforeseen effects.

Next, comprehensively spray the stained insoles with the cleaner. It's important to make sure they're visibly saturated but refrain from immersing your sandals entirely in any liquid.

Let the cleaner seep into the sandals for a couple of minutes. However, ensure not to let them dry completely.

Moisten the toothbrush under running water. Vigorously scrub the tarnished insoles with the old toothbrush. Every few minutes, rinse the toothbrush under running water to prevent inadvertently spreading the dirt back onto the shoes.

Once the sandals start to appear clean, gently wipe the scrubbed surfaces with your cloth.

Rinse the toothbrush under running water once again, proceed to scrub the shoes, and then wipe them with the washcloth.

Repeat this process until the cleaning cloth no longer picks up any dirt.

You'll be astounded by the transformation in your sandals when you've finished this process!