Bathroom Renovation Problems - grout removal

Following up the grout problem reported on 24 Nov, the owner has now applied a first treatment of Phosphoric Acid Substitute by Aqua Mix, with significant improvement. This first picture shows how the renovation company left the owner's patio.







This next picture shows the result of a single application of Phosphoric Acid Substitute followed by water wash.



The owner now intends to have the building cleaning firm mentioned earlier treat the whole patio, and this blog will keep you informed of the result.