First read this @ https://www.dailymail.co.uk/news/article-1362612/amp/Shopping-trolleys-contain-dirt-grime-average-public-toilet.html 

Most are not washed regularly so most carry so many germs and bacteria it's terrible.

Before using them use wipes , hand wash or very few stores do keep wipes and hand sanitizer. I bring my own bag and I also carry hand wash made by using organic coconut oil and organic Aloe Vera soap.

Really as most carry so much germs and bacteria your hands get them and transferred to your pockets , bags , wallets / purses that when you leave the store you are carrier of so much germs and bacteria.
Now shopping in Amazon fresh has advantages ..bring your own bag , no money transactions but just all done on mobile.

The best thing is you know most stores do not wash their trolleys or shopping basket's regularly so carry wipes or hand wash with you so you can wipe the trolley or basket you wish to use ...better be safe then sorry 

Cash Machines : British researchers recently discovered that cash machines have the same amounts and kinds of bacteria as are found in a public toilet.

Solution : carry wipes with you and just wipe the cash machine before using ...better to be safe then sorry