Categorize callback causes using fishbone logic before choosing a fix.
Sort each callback clue into a fishbone-style cause family. Method Materials Equipment People and training Measurement Environment Crew pulls full-width strokes on glass in direct sun. Solution bottle has no dilution mark and varies by crew. Squeegee rubber edge is nicked but still in rotation. New tech was never shown how to remove brittle screens. Checklist says tracks but does not define dry brush versus wet detail. Pollen blows onto wet storefront glass after the crew finishes. Crew details edges before finishing adjacent wet panes. Hard-water staining is sold as a normal maintenance clean.
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