Module 2 — Equipment & Chemicals: Decision Logic (Lesson)

What you’re doing today

You’re learning how to choose the least aggressive method that still gets the job done.

This is how you avoid damage, avoid wasted time, and stop guessing.

Why this matters

Most mistakes in exterior cleaning are not “bad effort.” They’re bad diagnosis.

If you pick the wrong lane, you get:

• poor results (“it didn’t work”)
• damage risk
• angry customers

Tools & materials (minimum viable)

• Phone camera (Proof Pack)
• A small test kit mindset (you don’t need 30 chemicals)
• SDS access (60-second rule)

The 3-step decision system

Step 1 — Diagnose the soil (what is it?)

Pick one:

• Organic growth (algae/mildew) → soft wash lane
• Oxidation (chalky paint/coating) → restoration lane or expectation setting
• Specialty stains (rust / hard water / irrigation) → spot-treatment lane or exclude

Step 2 — Identify the surface (what can it tolerate?)

Surface determines risk.

Roofs ≠ houses ≠ flatwork.

Rule: If you can’t name the surface, you don’t get to freestyle chemistry.

Step 3 — Pick the least aggressive plan

Start with the lowest-risk method and scale only if needed.

Step-by-step workflow (foreman routine)

1. Walk the property once.
2. Take pre-condition photos (worst areas + wide shots).
3. Pick a small inconspicuous test spot.
4. Confirm surface + soil category.
5. Choose your lane:
   • wash
   • restore
   • exclude
6. Communicate expectations before you start.

Decision points (if X, do Y)

• If it’s oxidation risk:

  • do not promise “like new”
  • sell “clean and improved” unless you’re doing a restoration scope

• If you’re unsure:

  • stop and test (or exclude)

• If a customer wants “aggressive”:

  • explain risk and why you won’t gamble their property

Common mistakes + fixes

• Mistake: treating everything as mildew

  • Fix: oxidation check before you spray.

• Mistake: using a new chemical without knowing compatibility

  • Fix: SDS first.

What good looks like

• You can explain your plan in one sentence.
• You documented pre-condition.
• You have an expectation line ready for exceptions.

How to prove it (Proof Pack)

Minimum shots:

• front elevation before
• worst area close-up before
• test spot photo

Do this next (assignment)

• Pick 3 surfaces (house, roof, flatwork) and write the “least aggressive” plan for each.
• Build a one-paragraph expectation script for oxidation risk.

References (SOPs + checklists)

• Chemical template:
• Chemical index:
• Proof Pack SOP:
• Final Walk checklist:

Printables

• Operator Checklist Pack (truck copy):

Gear Box (Amazon)

(Insert the relevant Gear Box module for this lesson here.)

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