As you found out Chemicals are useless and in many cases snaking is not going to work to get rid of smells.
The water you do see is possibly the water in the trap that keeps dangerous sewer gases from passing through the trap is called the trap seal.
Water Jetting will scour the lines and remove years of build up soap scum that can cause bacteria growth that causes odors.
You can also try Hydrogen peroxide to kill the bacteria as it is harmless to humans and pets
A chemical change always forms one or more products which can be elements, molecules, and/or compounds.
The reactants are transformed in products.
The formation of gas is:- a chemical process if the gas is the product of a chemical reaction- a physical process if the gas is the product of a change of phase as sublimation and vaporization
A chemical change always changes the chemical composition of the reactants to produce products with new and unique properties, different from the reactants.
Computer help to the company to advertise their products in various ways like, change the presentation of the product, change every thing easily, etc.
physical change
how might clouds change from a morning shower to a sunny day
Because it effects the water pressure of the shower. This causes the temperature of the water in the shower to also change.
The UK driving age has not changed for many years. Although there always various rumours, there are no confirmed plans to change it from 17.
When you are balancing known reactants and known products which is always the case when you are asked to "balance" a chemical equation you must not change the subscripts as that changes the reactants or the products to a different chemical compound.
Take a shower and change clothes.
Is the water too hot? When we wash ourselves in water that is too hot we appear to have a patchy red rash. If this is not the case then you could be allergic to something you are using in the shower. Change your products to see if it gets better. If it doesn't go and talk to your doctor about an allergy test.