I have a cactus I bought last fall. It has a growth I’m wondering if you can help me with. I’ve done some internet research and spoke to some friends who said it might be eggs. I cleaned them off with water and sprayed the plant with a water and soap mixture, but they came back. Any advice?
Without an image or a better description, I'm not sure what you had on the cactus.
Water is good to use to clean off insects or something like eggs.
You can gently use a soft toothbrush.
More serious infestations can be treated with Neem Oil, but use caution as horticulture oils can damage the natural oily skin of cactus.