I need a home made cleanser for a fish tank?

I just got a saltwater tank from my uncle and when he was cleaning a foreclosed home he found it and it had like ten fully decomposed fish in it and when he dumped it out the salt got everywhere and I've fixed the smell by taking out the gravel and cleaning it with baking soda and dawn dish liquid and it came clean and smells almost clean and now I have it soaking in bleach (yes I know I will clean it out well I had plans on that, I was gonna soak it then clean with dish liquid) and I was wanting to know what I could use to get the salt off, cause i dont want to scrub on the glass and scratch it up (I have been soaking it in bleach, dawn, baking soda, and water for about a three hours) but I was thinking can Lemon help with the smell and the acid of it cut through the salt and dead fish residue and help it sparkle or if anyone has any cheap home made cleanser ideas then please answer, and please make it really cheap I am kinda broke now