If your plant is too large to take outside or put in the shower, your best bet may be to spray the leaves and wipe them down with water and a soft cloth. It’s not good for your plant to put anything besides plain water on the leaves, so avoid the temptation to use any special ingredients or oils that can clog the plant’s pores.
If you have very hard water or a water softener, you may want to use a spray bottle of distilled water to avoid harming your plant. I use this small spray bottle from Amazon and a clean washcloth. Spray each one of the leaves, then gently wipe, then repeat until your plant is clean. You may need to do each leaf two or three times.
Downsides of this method: Wiping each leaf can cause trauma to your plant, so this is my least favorite method. It’s also impossible to get the undersides of your plant’s leaves clean and this method is time-consuming. Finally, I find it cumbersome and messy, since the dirty spray water will drip down around your plant. You may want to put a towel beneath your plant to protect your floor.
Take a look at your fiddle leaf fig plant’s leaves to see if it has gotten dusty or dirty over time. If it has, the spring is the perfect time to clean your plant so it can breathe easy and grow tall during the rest of the year! The size of your plant and access to the outdoors will affect the best method of cleaning for your fiddle leaf fig.