Having had a local window cleaning firm try to clean my panels last year and fail (they couldn't shift the lichen so gave me my money back) I thought I'd try getting a quote from a specialist company. Brace yourselves...
£525+VAT
That apparently involves a scaffold tower but if I'm paying that sort of money I might as well get them replaced with more efficient ones!
What power panels are they, and how much has output dropped?
I agree, for that sort of money I'd just be tempted to replace with higher output panels.
You could try and clean the panels once off the roof, then use elsewhere or sell if needed.
10x 405W JA Solar panels (4.05kWp) @ 5 degrees
3x 405W Longi panels (1.22kWp) @ 90 degrees
16.5kWh DIY LifePo4 battery
Solis inverter/charger
0.6kW Ripple WT
64kWh Kia E-Niro
Id ask for a breakdown.
If they are hiring the scaffold then it makes sense to be that high. Not that i think its a good price.
You want to check and see if they have their own scaffold tower and are cheekily charging you proper scaffold rates.
8x 395w Canadian solar (3.160kw)
Planned 20 440w JA solar (8.8kw)
12kw midea ASHP
3152W RE, Whitelaw Brae
3kw solis G98 grid tied
2x 3.6kw sunsynk ecco g99
4x16 280A eve batteries (57kw)
As their business is cleaning solar panels, commercial and domestic, I'd be very surprised if they didn't have their own scaffolding! I'll have a look at how much hiring a cherry picker or scissor lift for a day would cost, I'm not that keen on heights though...
It's a 2kWp system and has dropped from around 2000kWhr to around 1700kWhr a year although some of that (maybe half) is due to increased winter shading I can do nothing about (not my tree).
hd to hire a self assembly scaff tower the other month. £100/day with delivery
4.0kw FIT PV solar SunnyBoy 4000tl & 7 x 570w JA solar panels
7.410kw 13 x 570w JA Solar panels & Sunsynk ECCO 3.6kw.
7 x US5000 Pylontechs.
2 x 3.5kw A2A
4500l RWH
Biomass heating
Iboost divertor
Full house internal walls insu
600min Loft insul