killing germs at 60c

Hello Andy for years we have had a ritual of washing (cotton)things like underwear, towels and teatowels and socks even if they are not heavily soiled at 60c just because I read that germs and bacteria can survive temperatures under 60c. But after washing, I personally prefer towels and underwear dried in the tumble drier rather than on the line because they come out nice and soft. But (and I cannot remember how hot a tumber drier get on heat2 ) but is it likely that a Tumble drier gets well over 60c inside its drum when drying clothes? - if this is the case do you think I could lower the temp of the washing machine to say 40c or 30c and that the germs and bacteria will get killed when they are tumble dried at high heat? - whats your view?

I know you can get these 'liquid additives' to soap powder these days that claim to kill germs right down to 30c but i dont really want to go down that road . The tablets we use are Biological tablets and put 2 into the soap drawer on 60c wash if this has any bearing on things.