Enforcing use of biodegradable laundry soap

[David C.]

My wife and I are closing on a house with a guest home we will be using as a house hack and preparing to list one unit for rental. The unit we will be renting out only has a gray water drain in the laundry room. For this to be legal (and non-lethal to our plants) a biodegradable laundry soap must be used.

My question is how do we enforce this in our rental agreement? Has anyone done this before?

[Jennifer T.]

Although unusual, if it is that important to use biodegradable detergent, I would just provide tenants with that kind of detergent every month.  Heck, use it as a marketing angle in your ad, ie, "Biodegradable laundry detergent provided to tenant every month!"  And then charge a little extra $25/month.  Of course, you would also want to write it in your lease.  But, that doesn't mean tenants will necessarily do that all the time.