Cleaning virus and adware from computer

I help my family and friends with their computers when they have problems. One of them is adware and viruses. I have several scanning software I like to use (spybot, malwarebytes, windows defender). In order to install these applications I must hook their computer up to the internet. I don’w want to do it on my network and allow some virus or adware to jump to my computers. If I create a hotspot with my android phone for their computer to connect to. Is there any danger it will infect my phone?

Thanks.

Also if you have any favoriate cleaning software please feel free to mention it.

Thanks again.