# Seiso (Shine)

**URL:** https://kaizumi.com/dictionary/seiso

**Description:** Seiso is the third of the 5S steps - cleaning the workplace thoroughly while inspecting for abnormalities.

**Japanese:** 清掃 (seisō) — "cleaning, sweeping"

**Category:** lean-tools

**Tags:** visual-management

## Definition

Seiso, meaning "Shine" or "Sweep," is the third step of the 5S methodology. It involves thoroughly cleaning the workplace and equipment while simultaneously inspecting for abnormalities. Seiso goes beyond appearance—cleaning is also inspection. When operators clean equipment, they notice loose bolts, leaks, cracks, and wear that would otherwise go undetected. Regular seiso maintains equipment reliability, prevents contamination-related quality issues, and creates a pleasant work environment that people take pride in maintaining.

## Examples

### Manufacturing

> Daily seiso in a machining area includes wiping down machines, sweeping floors, and cleaning fixtures. During this cleaning, operators discovered a small hydraulic leak, a loose guard, and unusual wear on a spindle bearing—problems caught early before causing breakdown or quality issues.

### Healthcare

> Seiso in a patient room includes thorough cleaning of all surfaces and equipment. During seiso, staff noticed a frayed power cord on monitoring equipment, a loose rail on the bed, and damage to a wall—safety issues caught through cleaning inspection.

### Administrative

> Seiso in an office includes cleaning workstations and common areas. During this cleaning, staff noticed damaged chairs, malfunctioning equipment, and wear on frequently-used items. The practice extended to digital seiso—cleaning up files and maintaining systems.

## Key Points

- Cleaning is inspection—seiso finds problems while cleaning
- Regular seiso prevents contamination-related quality and reliability issues
- Seiso should be assigned and scheduled, not left to chance
- A clean workplace creates pride and encourages further improvement

## Common Misconceptions

**Seiso is just janitorial cleaning.** Seiso is performed by the people who work in the area, not cleaning staff. This is because seiso is inspection—operators know their equipment and can spot abnormalities that cleaners wouldn't recognize.

**Seiso can be skipped when busy.** Skipping seiso leads to equipment problems, quality issues, and degraded work environment. The time invested in seiso prevents larger problems.

## Try It

Shine is the third section of the audit below, and its items go past appearance. They ask whether cleaning responsibilities are assigned with schedules, whether cleaning supplies are usable and stored properly, and whether sources of dirt have been found rather than wiped up again. That last item is where most areas lose their points. Score one real area and see how Shine sits against the rest.

<!--TOOL:5s-->

## See Also

- [Total Productive Maintenance](/dictionary/total-productive-maintenance) - Operator-led equipment care that starts with cleaning

Source: https://kaizumi.com/dictionary/seiso
Licence: free to quote and cite with attribution to Kaizumi.