I'm a no on this but am I being too harsh?

And I should go for heat treatment, not chemical, correct? 

Not to sound harsh, but it is next to impossible to find anything that hits the numbers you described above.  

Tenant agrees to notify Landlord in a timely manner of drain stoppages that they are unable to clear themselves.DRAIN CLEANING PRODUCTS.Tenant agrees not to use caustic drain cleaning chemicals in any of the drains or plumbing fixtures.Such products may cause damage to the plumbing system and may be hazardous to the environment and to people who may come into contact with such product.Tenant may be able to keep drains clean and clear with regular maintenance by pouring down the drain a quarter cup of baking soda followed by a half cup of vinegar.If there is a minor clog in the p-trap (the curved portion) of the pipe under the sink, Tenant may disconnect the pipe, clear the pipe manually, and reconnect the pipe to clear the clog or may call Landlord for assistance.

Talking about the harsh realities of this business does not sell as many courses or books.G;ad you have knowledge and are willing to give it away for free, although who is to say you must only give it out for free?

The new refrigerant R410 when expose to air containing chemicals found in some typical household cleaners can cause the copper coils to fail prematurely.

Pretty harsh responses coming in from a lot of folks who've never lived in, nor most likely never invested in Temecula.

. - I don’t say this to be harsh.

There are people running into the harsh reality that they cannot pay rent or they cannot afford the place they are currently living.

My son in law is a black man, and I have seen over the years when people have treated him harshly.