Hi, I bought my first fleshlight 5 months ago, and It's getting stickier and stickier by the time, Heard that using the renewing powder fixes the issue, but I don't have it, also heard that Cornstarch can also be used, any one has an idea on the issue ?

Yes, renewing powder is just the cornstarch as claimed by fleshlight.

Yes if you check the label you’ll see it’s just regular cornstarch sold at a premium price. I’ve also heard of people using talc powder as well but haven’t tried it personally.