John Frieda Color Glazes surprisingly work really well! I used to use the blonde version (which I think has been discontinued) but have also used the clear version as well. First of all, it's really easy and quick to apply. Secondly, it makes hair super super soft, silky, and shiney. Third, it actually smells pretty good. Lastly, it lasts a pretty decent amount of time.
You can purchase this at pretty much any drugstore, grocery or beauty store (like ULTA). And they aren't too expensive either!
Hope this helps and best of luck!