I bought 10â human hair extensions and found them really good. However, I kept them in by box after wearing it at the prom party. Now, I have to attend my cousinâs wedding tomorrow, and when I opened that box, the hair extensions smelled like rotten eggs. I put hair spray on them, to subside the nasty smell, but it didnât help. I just canât seem to think about anything now, and want some tips on making it normal again. Would you recommend washing it with conditioner, and then blow drying it? Please help me!