[mammta21]

That doesn't surprise me one bit.

As long as there's some type of attraction (food or otherwise), there will always be a possibility of rats being present - which Is what makes your strategy In this thread so effective.

Rats are bad but fleas will be the last ones standing when all is said and done. I had a 6 month infestation(I own no pets) and tried ever legal and illegal pesticide until I finally researched  Isoxazoline's and started taking the prescription dog med Nexgard(Afoxolaner) and that finally broke the cycle and killed them after a month.
Fleas have killed more people than all the wars combined and the black plague decimated 1/3 of the worlds population which wasn't rats but the human flea.

That's a very good point with fleas.

It can also be used to get free hotel accommodation.

True, have ever successfully tested it?