The worst part of making a smoothie is never the smoothie — it’s the ten minutes of scrubbing stuck banana and seed bits out from under the blades afterwards. Most blenders can clean themselves: fill the jug halfway with warm water, add a single drop of washing-up liquid, blend on high for ten seconds, and rinse. The same blades that trapped the food blast it off.
Why Blenders Clean Themselves So Well
A blender blade spins at up to 20,000 revolutions per minute. That’s the same force that pulverises ice and frozen fruit — and it’s more than enough to dislodge food stuck in the crevices around the blade assembly. The soapy water forms a vortex that reaches every corner of the jug, including the impossible-to-reach spots underneath the blades where fingers and brushes can’t safely go. You’re not scrubbing; you’re letting the machine do exactly what it was designed to do.
The 10-Second Self-Clean Method
- Rinse the big bits out immediately. As soon as you’ve poured your smoothie, give the jug a quick rinse under the tap to remove the thickest residue. This takes five seconds and makes the self-clean twice as effective.
- Fill halfway with warm water. Not hot — hot water can warp plastic jugs and damage rubber seals over time. Warm is perfect. Halfway up is plenty; you don’t need to fill it to the top.
- Add one drop of washing-up liquid. Literally one drop. A squirt too much and you’ll be dealing with a jug full of foam that takes longer to rinse than the smoothie took to make.
- Blend on high for 10 seconds. Put the lid on (yes, even for cleaning) and blend on the highest setting for ten seconds. You’ll see the residue lift straight off the sides.
- Rinse and air-dry upside down. Pour out the soapy water, rinse once with clean water, and leave the jug upside down on a drying rack. The blade assembly air-dries and you never put your hand near a sharp blade.
For Dried-On or Smelly Residue
If you forgot to clean the blender and yesterday’s green smoothie has dried on like concrete, do the self-clean twice: once with the soapy water, then a second round with warm water and a tablespoon of baking soda. The baking soda is mildly abrasive and also deodorises — it kills the sour smell that old smoothie residue leaves behind.
For a blender that smells of garlic or onion after making soup or pesto, add a squeeze of lemon juice to the second blend. Citric acid neutralises odour-causing compounds far better than soap alone.
What NOT to Do
- Don’t put your hand in to scrub. Blender blades are designed to cut. Even when unplugged, they can take a slice out of a sponge — or a finger. Let the vortex do the work.
- Don’t use the dishwasher for the blade assembly. The high heat degrades rubber gaskets and dulls blades over time. Hand-wash the base by wiping it with a damp cloth.
- Don’t soak the base. The motor housing is not waterproof. Water that seeps into the base can damage the motor permanently. Clean the base with a damp cloth only.
Make It a Habit
The whole method takes about thirty seconds from start to finish, and it’s the difference between a blender you use every day and one that sits in the cupboard because you dread cleaning it. The trick is doing it immediately — dried smoothie residue is ten times harder to remove than fresh. Blend your smoothie, pour it, clean the jug while you drink.
FAQ
Does this work for nut butter or sticky mixtures? Yes, but run it for 20 seconds instead of 10 and use two drops of soap. Really thick residues like peanut butter may need a second round.
Can I use this method on a food processor? The same principle works — warm soapy water, a quick pulse — but food processors have more corners and a feed tube, so give those a quick wipe too.
Will dish soap leave a soapy taste? Not if you rinse once after emptying. One drop is so little soap that a single rinse removes it completely.
My blender jug is plastic and smells permanently of old smoothies. Help? Do a baking soda round, then leave the jug in direct sunlight for a few hours. UV light and the soda together break down the odour-causing residue trapped in plastic’s microscopic pores.
Love this kind of natural cleaning? Check out our microwave steam-clean method using lemon — same philosophy: let heat and simple ingredients do the scrubbing for you.