Welcome aboard!  Glad to have you here!

To answer your question:

In my opinion, none.

I don't bathe, wash dishes or wash clothes in the lake water.  I take water FROM the lake and go "in-land" to perform those duties.  When finished, even rinse water is dumped far away from the lake.  

If the lake water is cool (e.g. May), I take a solar shower and do a head-to-toe wash (as long as you don't waste the water, it is sufficient for a descent bath).   In warmer periods, I use my dish-washing buckets to load up with an ample water supply (for either bathing or washing dishes/clothes).  I use color-coded buckets ... red for soapy water, blue for rinse water.  

Alternately, I do a non-soap rinse in the lake (e.g., swim) to feel refreshed.  I chose this method during a recent trip to Woodland Caribou PP and was pleasantly surprised by the water temp (warmth).

In any case, I use any of the many brands of biodegradable soaps that are available from a variety of retail outlets for all of my clean-up functions.  Remember that a "low suds" product will rinse more quickly than a large volume of bubbles.

dd