Two issues with Mapei Ultracolour Plus grey grout

[hmtiling]

Or better still (in my opinion) Universeal Grout rescue).

I've tried both and the Grout rescue is a far superior and more user friendly product. However, I would advise purchasing the pre cleaner too.

the pre cleaner won't be needed on brand new grout

 

[Sean Kelly]

the pre cleaner won't be needed on brand new grout

That's what I thought a couple of weeks ago.

I spoke to one of their tech guys who told me to always use the cleaner even on new grout. Think of it as a primer he said.
I for one will always use it in future.

 

[hmtiling]

That's what I thought a couple of weeks ago.

I spoke to one of their tech guys who told me to always use the cleaner even on new grout. Think of it as a primer he said.
I for one will always use it in future.

Sounds like a sales pitch to me. I've used fuga fresca and grout rescue on new grout and it takes very well. On old grout the pre cleaning is essential

 

[Italy]

you have already tried a first cleaning with the keranet
or similar?

https://cdnmedia.mapei.com/docs/librariesprovider2/products-documents/152-keranet-gbfd02f77779c562e49128ff01007028e9.pdf?sfvrsn=2bf29507_0