I can’t stress enough the importance of washing well all your produce before eating it or using it in your cooking. The produce you buy has passed soooooo many hands between being picked in the field until you get it home – and that does not count all the dirt, smog, wax, pesticides and insecticides sprayed over them.
I fully advocate washing well all produce before using it or consuming it – even if you’re peeling it.
In the yoga center I attend, we need to peel most produce before using it, especially those vegetables that have wax sprayed on – apples, pears, cucumbers, tomatoes, grapes (yeah, not nice and very time consuming when we need to make a fruit salad), oranges, peppers, etc.
To make my life easier at home and to preserve the nutrients and fiber in the peel of produce, I use a product I learned about when I worked at Procter & Gamble called FIT.
Fit is a solution made from natural ingredients designed to take most of the dirt and wax of the produce we use. I buy it in my neighborhood health food store and I find that it takes the entire waxy residue off the tomatoes, cucumbers, pears, etc. It also helps clean my lettuces, spinach, or any leafy green.
I use the little sprayer for individual items and I soak for anything that’s larger or leafy, like leeks, lettuces, cabbages, herbs, etc.
I am not a scientist, but I like that their ingredient label states natural sources for their ingredients. I no longer work at P&G, and they licensed the name to another manufacturing company, but I still feel Fit is a great product that helps me eat produce more naturally without the added toxins on the produce’s skin.
KarmaFree Cooking 
There is a product that is just called “Veggie Wash” that is very similar and works well too. I have a hard time finding FIT here anymore.
I use a similar product, for now, but on an episode of America’s Test Kitchen (I think) they tested a number of these products and found that a solution of vinegar and water mixed in a spray bottle worked just as well as if not better than the commercial products . . .