How to clean a stubborn fishtank?

I have a fishtank that hasn't been used in a while and unfortunately I neglected to get the little water and all the sand out until a couple of days ago. Ive heard that to clean a fishtank avoid using any contemparary household clean detergents. This "gunk" (dried sand) on the glass is tough to remove. I promise this time I'll take care of my tank- I just need an opportunity to a second chance.

hears a potion 2 get it out water t ornge joos mixed using a leather rag or scrap

HiWe have used Bi-Carb of Soda with excellent results. Sprinkle the bi-carb over the affected areas and scrub with a soft scourer. Be liberal with the bi-carb. Once clean all you need to do is give it a quick rinse and it's all done.

One way is to use sand or tiny rocks to scrub the glass, or you could try a sponge like the one you would use to do the dishes.

vinegar is harmless... for real stubborn mineral stains, let it soak on the edges and use a good plastic scraper. Do not use anything abrasive as it will scratch the glass.It took for a whole day and some to scrape out an used 135G tank I bought. Cheers

filter

Let it sit with water in it. Don't use unnecessary chemicals it is a risk you don't need to take. If after a day of sitting in water the stuff still won't come off then don't worry about it (I'm assuming this is small patches). Throw new gravel or sand on it and start cycling your tank. As long as you know it is stuff that was in your tank before then it isn't a big deal.

You can buy a razor blade glass scraper in paint departments. They will remove all deposits off the glass without scratching the glass ( I use it for my marine tanks).

Only use hot water to clean it. Do not use soap.

check at ur local pet store and see what they have