I am new to the forum, and not a flooring professional. The topic has been already touched upon, but I could not find all the answers I need. Professional guys out there, please tell me a reasonable way to remove the vinyl floor from the concrete in the kitchen area. Currenntly, I try heat gun, and scraping. The fumes are killing me. Is there a better way ? After scraping, there is still some vinyl glue left on the concrete. Do I need to remove it ? If so, how ? I tried chemical agent, such as Jasco's semi-paste stripper, it is costly, slow, and has to be repeated a few times before the concrete becomes CLEAN. Any suggestions?
I am going to lay bamboo floor with urethan based adhesive: Chemrex 941.
Good advise is highly appreciated.

Vinyl adhesives are tough to remove. They are rubber/latex based and will dissolve under certain circumstances. I've used boiling hot water and a razor scraper with success but it takes a few times. I'd avoid using your heat gun on the vinyl. You're burning plastic and putting toxic fumes in the air! The process is as follows:
TO REMOVE VINYL FLOORS FROM CONCRETE SLABS ONLY, NOT WOOD.
1) remove vinyl layer from felt backing by ripping it off. Some will be more difficult than others but you need to get to the felt backig.
2) Pour boiling hot water on the floors and let soak for 10 to 15 minutes. Push hot water around with push broom.
3) scrape off felt and adhesive with razor scrapers. Change blades often and keep alternating back and forth each side of the razor.
4) Repeat 2 and 3 as needed. Sweep up debri and dispose. Using a wet/dry shop vac, vacuum up all the excess water and moisture. Allow concrete to dry thoroughly.