Question I am concerned that my clothes have become infected with springtail. I read online that if this happens washing and drying clothes will not have any effect on them.
Unfortunately you have encountered one of the many Internet myths about collembola or springtails. These primitive insects do not infest homes or clothing nor do they bite, see http://www.livingwithbugs.com/springtails.html for detailed info. They will occasionally enter homes especially following heavy rains but they cannot live in homes for long because they will dry out and die.
I can answer questions in any area of entomology (study of insects, spiders, mites, ticks, and other terrestrial arthropods). Contact me about home and garden insects, insects that bite and sting, and insects that damage homes such as carpenter ants and termites.
20 years as university extension entomologist, now retired; currently publish a website about home and garden insects.
Publications see www.livingwithbugs.com/resume.html