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Is Dish Soap Safe for Eyeglass Lenses?

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Someone saw their manager washing glasses with dish soap. Zeiss lenses cost real money—would long-term washing ruin the coatings?

On V2EX, about a hundred replies turned “is this allowed?” into “this is the correct method.”

Source: V2EX #1254628

Bottom line

洗洁精洗眼镜靠谱吗 — overview

Neutral dish soap is the recommended path, not a hack. Zeiss’s own cleaning guide, opticians, and Essilor support replies in the thread converge: rinse dust first, foam second, rinse again, avoid dry rubbing.

The haze you blame on detergent is often micro-sandpaper: wiping grit that was never rinsed off.

What the thread argued

  1. Dish soap is fine—and frequently “most recommended”
  2. Clear water must remove grit before any wipe
  3. Cloths/tissues used dry are the main damage vector
  4. Resin lenses are consumables (~2–3 years); transmission drops anyway
  5. Shop ultrasonic baths get blamed by some for scratches

Body wash/shampoo split the room. Alcohol/IPA too: loved by some, coating-risky for others, especially photochromic lenses.

What 100 replies mentioned

MethodMentionsTone
Dish soap46Primary recommend
Tissue17Dab OK, scrub bad
Water rinse16Step zero
Hand soap13Usually fine
Lens cloth8Often criticized
Body/hair wash7Mixed
Lens wipes7Outdoor compromise
Alcohol5Contested
Ultrasonic2Mostly negative

Hard evidence against dish soap barely appears. What people reject is bad friction and the wrong chemistry for special coatings.

A low-scratch routine

洗洁精洗眼镜靠谱吗 — detail

  1. High flow rinse both sides
  2. Neutral dish soap foam on wet fingers
  3. Gentle two-finger pass—no pressure grinding
  4. Rinse clean
  5. Sheet of fine water to carry droplets off hydrophobic coat, or dab with tissue
  6. Nose pads may green from trapped water—cheap to replace

Many “lens sprays” reportedly smell like… dish soap.

Three takeaways

  1. Even expensive Zeiss glass follows the dish-soap manual
  2. KPIs are dust → oil → minimal friction, not fancier cloths
  3. Budget lenses as consumables; clarity from replacement often beats museum-grade babysitting

The expensive move isn’t the pump of detergent. It’s the one hard wipe with grit still on the lens.

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