Plumber left ? Grout all over sink how to fix

[millym]

Hi
Just spent an arm & a leg getting new shower installed , just cleaned bathroom today ( yes i had a lazy week) & noticed the sink is covered in thin splashes of something that has set hard. Im suspecting watery grout not rinsed away. The job was done a a week & a half ago - i think my chances of proving it to the big well known London company - that it was not like that before the plumber was here are virtually none!
So any clues,ideas what i could use to try & get it off? Ive read about some Hagesan? Products & something called sulphamic? Acid but i dont want to go gung ho & find I have a dissolved sink dripping on the floor. Im not impressed to say the least the sink is not even 2 years old. Any help most appreciated.
Thanks

 

[snb]

elbow grease and kitchen sponge scourer

 

[millym]

Wont it scratch the sink? Thanks

 

[Hot&Cold]

Usually the products are already in your cleaning collection

Cif cream cleaner,the one with micro crystals and a not to abrasive (used) damp scourer pad sponge will work.

Test a hidden area first,you may have some fancy type of sink or basin

 

[SwitchTheElectricsOff]

I've just done a tile job at my inlaws, grout all over the place! I used cif and lots of elbow greese, comes off no issue at all

 

[Nige F]

How much £ was it ?

 

[lemon_1]

Was it pimlico ?

 

[Ian H]

Finger nails are good too.

 

[footprints]

methylated spirits

 

[Nozzle]

Anything that's acidic. Lemon Juice, Vinegar or off the shelf limescale stuff

Nozzle

 

[millym]

Thanks all much appreciated...the £-1700 ouch ...for whole new shower innards,re tiling etc...but was quoted not far off that from 3 other companies. Yes Pimlico, but they've done a few jobs for me & compared to some others I've used I've found them reliable .....start,finish do what they say ( apart from this time - grout down the sink trick !)........ at the price they quote. Have had several disappearing plumbers in past & rip off experience of 3 to not fix a leaky loo last year ( til Pimlico fixed it finally). My sink is a sink - white thing ? porcelain ?ceramic - modern square sort of shape but not marble,slate,stone,glass or 18k gold.
thanks again

 

[Mopasgas]

,if you ever see tiler ,fitter ,etc washing grout or cleaning tools and sponges down the sink/bath /toilet /shower /(.gully in road its Illegal )...throw them off the job immediatly and dont pay them .until you have a proper tradesman come and clean all your traps and waste pipework,deduct cost from their invoice It aint called waterproof grout on the tub/bag for nothing ,I have cleared loads of these over the years after so called tradesman/women,