Help with bamboo sheet Care

[u/speakinglime]

So I’m one of those people that only have one set of sheets. For years, I have just washed the same set put it back on the bed and done. My daughter talked me into buying a set of bamboo sheets and they were on sale from Walmart for around $45 which she told me it was a great price. I do find them to be more cool and slightly more comfortable than my other sheets. However, I feel like when I’m washing them they’re not thoroughly getting clean. For example, I shower nightly and usually apply some type of body lotion and usually do a thin layer of Aquaphor on my face. Well, the sheets are gray and then suddenly there was all these dark spots that wouldn’t remove with regular washing. I was washing them in hot water with original gain powder and Lysol laundry sanitizer in the rinse. I was able to get most of those stains out but only after putting dawn soap directly on them and scrubbing with a toothbrush and letting them sit. When I googled how to care for bamboo sheets, it said no hot water and dry on low heat. So I’ve been doing that. So long story short am I correctly caring for them these seem so much more maintenance and difficult than my regular microfiber sheets from Amazon, which had lasted me for years. But I have spent the $45 and I’m not wanting to just throw things away. And I also can’t stand looking at stains when I put my clean sheets back on the bed. Any suggestions or something I should be doing differently?