Re: Problem... please lend some information
i would bet large amounts of money that the rust is not causing your sickness, probably QLs or to much nicotine or a combination of that.
best way to get rust off is a brilo pad(green scrubby) but it does leave a rougher finish slightly.
but if it is a cheap hookah i would just trash it because if it came easily it will come back
i clean my rig every day i smoke, usually before (because i have been lazy so i dont do it after). i brush it with soap, rinse, fill with vinegar or lemon juice let it sit 15-60 seconds drain, rinse (i use the vinegar/lemon since i have a mya that i cannot brush all the hollow spaces with and the acid slightly etches the metal out)