How to peel grape skin off easily?

Love grapes but hate to peel the skin of grapes which is often very difficult to come off? I finally found a good method to rinse the grapes so that the skin can peel off easily.
Rinse grapes and then rub grapes with salt and flour. Rinse flour completely off the grapes and that the skin of grapes can come off easily when peeling. This method can also help to get rid some of the chemical toxins from pesticides.