Ok, so I've flown back to my flat for the festive season to find the BFF (who is renting it from me) hasn't cleaned the bathroom in 4 months!!!! He uses bar soap in the bath/shower and has managed to recoat my beautiful enamel bath with a thick layer of soap scum. After scratching the hint 'CLEAN ME' into it, he asked me how. 'No bleach' as Ive told him, but everything else we tried was futile. Cillit Bang just rolled off it and it laughed at the boiling water I poured over it. Short of making BFF scrub his way through it with his Hobbit feet Im clueless as to what to do without damaging the bath. Google has supplied various 'remedies' but none have worked. Not tried the 'industrial' ones.....
and I won't start with the pink/black spots previously white shower curtain!