Bellinzoni Detergent Bert 27 - 1L
This is an extremely concentrated, acid-based detergent for rough granite, ceramic or porcelain tiles. It should only be used for strongly-resistant soiling or to eliminate rust or potassium nitrate.
One of its great advantages is that it forms a layer of foam that does not drip when used on vertical surfaces, so it is especially useful for the deep cleaning of wall-tiles immediately after fixing.