Selling cls equipment

Hey all! Wondering about what guidelines one should follow when selling extraction equipment, mainly cls equipment. Just to make sure one is not held reliable or responsible for anything after selling the equipment. Would a detailed bill of sale be enough? Most of the equipment is bought online so the equipment is tied to ones name on a card…

Anything one should do or keep in mind when selling old equipment?

I am in the market for equipment. I am looking for a smaller system, but let me know what you have.