Hard Stains
Follow 4 steps: (1) name the stain → (2) grade Intensity → (3) grade Coverage → (4) read the matrix.
Step 1 — Name the stain
Stain |
Group |
How it looks |
Where you see it |
|---|---|---|---|
Grease & Oil |
A |
Sticky brown / black oil and smoke layer, burnt crust |
Chimney, hob, tiles behind stove, exhaust fan |
Rust |
A |
Orange / brown marks on metal, rust rings |
Stove, chimney, sink edge, fridge, cabinet baskets |
Fungus |
A |
Black / green / grey mould spots |
Fridge gasket, grout, sink cabinet, damp walls |
Yellowing |
A |
Surface turned yellow / brown with age or heat |
Fridge body & gasket, switchboards, white tiles |
Water |
B |
White chalky rings / spots, scaling |
Sink, taps, slab near sink, tiles |
Ink |
B |
Pen / marker marks |
Cabinets, fridge door, walls |
Cement |
B |
White cement / plaster splashes or lumps |
Tiles line, sinks, windows |
Paint |
B |
Paint drips, dots, splashes |
Tiles, glass, window grills, slab |
Step 2 — Grade Intensity (Low / High)
Intensity = how deep the stain is. Mark High only if you can see one of these signs. If you cannot see any of them, it is Low.
Sign |
Name |
What you must see |
|---|---|---|
I1 |
Surface hidden |
You cannot see the surface under the stain (colour / shine / pattern hidden). |
I2 |
Thick / raised layer |
Crust, thick sticky grease, raised scaling, cement or paint lumps. |
I3 |
Surface eaten / soaked |
Rust flaking or with holes; fungus inside grout or gasket; paint / ink soaked into stone. |
I4 |
Scrub does not work |
Partner scrubs on video with the right chemical and nothing changes. |
Step 3 — Grade Coverage (Low / High)
Coverage = how much area is stained. Mark High only if one of these is true, otherwise Low:
Sign |
What you must see |
|---|---|
C1 |
Stain covers more than half of the item (e.g. more than half the chimney, more than half the wall behind the hob). |
C2 |
Stain is on 3 or more items (e.g. chimney + hob + tiles). |
Step 4 — Decision matrix
Level |
Intensity |
Coverage |
Group A — Grease & Oil, Rust, Fungus, Yellowing |
Group B — Water, Ink, Cement, Paint |
|---|---|---|---|---|
L1 |
Low |
Low |
DOABLE + Demo |
DOABLE + Demo + Calling Cx |
L2 |
Low |
High |
DOABLE + Demo |
NOT DOABLE |
L3 |
High |
Low |
DOABLE + Demo |
NOT DOABLE |
L4 |
High |
High |
NOT DOABLE |
NOT DOABLE |
|
Group A (AND): Not Doable only when Intensity AND Coverage are both High. Group B (OR): Not Doable when Intensity OR Coverage is High. Doable + Demo = do the full job with Demo proofs |
