best way to clean grout plaster adhesive paint ect off tiles

[EverDon Tiling]

Just been to our local newly fitted out shop i know the guy who owns it and he's asked me if i will clean the newly laid floor. Its a right mess theres loads of marks, grout, cement, plaster you name it its on there the shop fitters who laid it have told him its not there fault and wont sort it. what is the best way i could go about sorting it for him any ideas welcome here's a couple of pics.
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thanks

[jay]

Might be best to walk away from it,as once you try to clean it it becomes your problem and all the marks might not come out ,get the shop fitters back

[EverDon Tiling]

thats what i've told him but he's said they wont come back i had a go cleaning a couple of tiles with just water and a sponge and it seemed to do the job. I was thinking may be brick cleaner and a good old scrub if it dosent work ill just say i cant do it he will be ok with that.

[jay]

Has he paid the shop fitters .just be careful with the brick cleaner

[EverDon Tiling]

No he still owes them a fair bit i told him to get them back if they refuse then not to pay till its sorted. I think he just wants it sorting asap as he's got a new shop with a s**t floor.

[jay]

just tell him to contact them letting them know whatever it costs to clean floor will be deducted of there bill .good luck

[Bri]

LTP grimex has never let me down. Have a go with that.

[EverDon Tiling]

LTP grimex has never let me down. Have a go with that.

would this remove grout and plaster and how for does it go there's a good 80m2+ that needs cleaning

[EverDon Tiling]

Do you think this would be any good ?
::: Geocel : Geocel ECOCHEM BRICK AND MORTAR CLEANER :::

[Dave]

Grimex for me too..

[Mccormac tiling]

Grimex seems to do the job.