A penis enlarger is generally made of plastic. That means it can be easily cleaned with warm water and a little mild soap . Be careful with hot or boiling water, as this can melt or deform the penis stretcher. You can also use a toycleaner for accurate cleaning. After you have cleaned your stretcher, you should dry it well with a clean and dry cloth . Make sure that all soap residue is thoroughly washed away and that you have also dried the cracks.