2 story house dwn stairs toilets don't flush solids
I have a 2 story house with 3 bathrooms built in 76... 2 days ago the 2 toilets downstairs started to act up and won't complete flush cycle 7 out of 10 times... solids remain... I have a 50' auger and have snaked the line from access outside kitchen wall and also from back center of house. Nothing seems to help. I poor bucket of water in bowl and toilets drain correctly. I do not have a tree near my sewage lines. The kitchen sink is now starting to drain very slowly also.
1.) How do I locate the vents that are referred to so often?
2.) Is there a chemical/cleaner that can be used other that the useless liquid draino type products?
3.) Is the kitchen sink just a coincidence?