A few weeks ago I posted about a problem with bubbles and soap going
into a tiolet when the washing machine runs. I tried snaking it every
which way, etc.

I had read about suds zones which gave me an idea. I switched back to
Arm-n-Hammer detergent (instead of Tide) and the problem is
non-existent.

Hope this helps someone (given this is common problem discussed in this
group.)