Cleaning mistakes to avoid before starting
Published on 31 July 2026 · Verified on 19 September 2026 · The Mestravaux.lu team
Identify the surface, dirt and products already used before cleaning. A stronger chemical or more powerful machine is not necessarily suitable. This guide helps prepare the service; it does not price hypothetical repairs or replace post-incident assessment.
The essentials in 30 seconds
- Do not mix cleaning products, even for a trial.
- Check surface and equipment instructions.
- A compatibility test does not guarantee the whole surface result.
- A removed stain does not prove the moisture source has been resolved.
Mixing or layering products
INRS distinguishes dangerous gases from bleach mixed with acids or ammonia. Do not mix cleaners. A small amount or an open window is not a safety test.
| Erreur | Coût de la réparation | Coût de l'intervention pro évitée |
|---|---|---|
| Haute pression mal réglée (bois/joints) | 300 – 800 € | 80 – 150 € (nettoyage adapté) |
| Moquette/tapis sans test préalable | 30 – 60 €/m² (remplacement) | 4 – 8 €/m² (injection-extraction pro) |
| Ramonage négligé + sinistre | Plusieurs milliers d'€, non garanti | 60 – 100 €/an |
| Séchage tardif après dégât des eaux | 500 – 1 500 € (anti-moisissure) | 150 – 400 € (séchage immédiat) |
Fourchettes indicatives à titre d'ordre de grandeur ; le coût réel dépend de l'ampleur du dégât constaté sur place.
Getting help after exposure
In Luxembourg, contact the Poison Centre promptly on 8002-5500 with the label or UFI code. For life-threatening situations, including breathing distress, call 112. Do not delay to obtain a quote.
Choosing equipment without identifying the surface
Kärcher's PCL table distinguishes compatible surfaces by model and brush. It does not approve every cleaner for every wood or stone. Confirm the method for the finish and joints; no universal pressure setting is given here.
Treating a whole carpet before evaluating results
Provide the label, known material, previous treatment and stain origin. Request an instruction-compatible trial and assessment after drying. This does not promise removal of every stain or identical results elsewhere. Agree furniture moving and return-to-use arrangements.
Your project deserves an accurate estimate — it's free.
Request a quoteConfusing a clean surface with a dry building
Logement.lu emphasises finding the cause of mould. After a leak, have affected components and drying assessed before refinishing. No single interval can establish that every home is dry or free from risk.
Assuming maintenance and insurance scope
Routine cleaning does not replace leak investigation, repair or technical flue maintenance. Confirm the appropriate trade and records supplied. Preserve findings and contact the insurer after damage; no automatic cover or exclusion is inferred here from one missing record.
Frequently asked questions
Can a discreet trial test a mixture?
No. Do not mix products. A compatibility trial concerns a product allowed by its instructions on an identified material.
Is pressure washing suitable for every terrace?
No. Identify the surface, finish and compatible method first.
Does removing a stain mean the surface is dry?
No. Visible cleaning and drying assessment are separate.
Does cleaning repair a damaged finish?
Not necessarily. Separate dirt removal from repairs in the offer.
Take action
Your project deserves an accurate estimate — it's free.
Request a quote