Not marble, but Neolithic ceramics (scratch test and acid test passed).
Photo: Delia Deppert (Magna Naturstein)
‘Dirt polish’ removed with basic cleaner; restored to original condition.
to the floor. The cause of this – in addition to overdosing – is
‘low-aqueous’ cleaning. The surfactant residues on the floor, the
lime from the water and not to forget – the dirt as well –, all join to
form a very sticky yet thin layer that can even be polished. Hence
the name ‘dirt polish’.
This layer can almost never be eliminated with a basic cleaner; in
almost all cases, only the uppermost layer is removed; it is then
replaced by the basic cleaner with a new one. Dirt polish can be
removed with microfiber pads and clear water – but it takes time.
Faster methods must be examined on a case-by-case basis.
Carrying out a slip test is relatively simple. A little non-carbonated
mineral water is applied to the floor; approximately four minutes
later, the spot is rubbed with two fingers. It the spot feels slippery,
detergent residues are the culprit, because no natural or artificial
stone flooring can be superficially dissolved and smeared by water.
Stain removal and more
The FRT guide has much more to offer than these three tests.
Its stain removal concept for natural and artificial stone has
been developed over decades of experience by the participants.
Images of damage with explanations round out the guide. The
guide is often used as a basis for expert appraisals and to assess
whether a cleaning
job and the method used meet the recognized
rules of practice. This is also true for tenders. The
sentence “Maintenance cleaning must be effected in such a way to
preclude the need for basic cleaning” does not meet the generally
accepted trade practices
as required by the BGB, and it can thus be
considered void in the event of a lawsuit. This is why the FRT guide
is a must for every object manager, division manager, or master and
technician. It can be obtained free of charge from the Europäischen
Forschungsgmeinschaft Reinigungs- und Hygienetechnologie
under firstname.lastname@example.org or by telephone under +49 (0)2151 8210110.
Usually, the guide is also available from the guilds. N
Herbert Fahrenkrog | email@example.com
Magna Naturstein, consulting services |
Tel. +49 (0)212 2442395 | Fahrenkrog@magnastein.com |
Meet us at CMS 2017 Berlin
We’re looking forward to your visit – Hall 1.2, Booth 103
GLOBAL CLEANING | ISSUE 2017 17