--- title: The glass of my SPIN 900 | 1200 | 1500 is sooty – why? description: Use only original höfats bioethanol for a soot-free burn. Clean the glass cylinder only with warm water and dish soap. --- [Skip to content](https://support.hofats.com/en/faq/das-glas-meiner-spin-900-i-1200-i-1500-ist-verrußt-schwarz-warum#main-content) - [English](https://support.hofats.com/en/faq/das-glas-meiner-spin-900-i-1200-i-1500-ist-verru%C3%9Ft-schwarz-warum) - [Deutsch](https://support.hofats.com/de/faq/das-glas-meiner-spin-900-i-1200-i-1500-ist-verrußt-schwarz-warum) - [Français](https://support.hofats.com/fr/faq/das-glas-meiner-spin-900-i-1200-i-1500-ist-verrußt-schwarz-warum) - [Nederlands](https://support.hofats.com/nl/faq/das-glas-meiner-spin-900-i-1200-i-1500-ist-verrußt-schwarz-warum) English Show submenu for translations [Your question is not listed? 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Please contact our service team here](https://support.hofats.com/en/faq/kb-tickets/new) Welcome to the höfats Service Center - There are no suggestions because the search field is empty. 1. [FAQ](https://support.hofats.com/en/faq?hsLang=en) 2. [Product questions](https://support.hofats.com/en/faq/product-questions?hsLang=en) 3. [SPIN 900|1200|1500](https://support.hofats.com/en/faq/product-questions?hsLang=en#spin-90012001500) # The glass of my SPIN 900 | 1200 | 1500 is sooty – why? Bioethanol from other manufacturers can cause the glass to become sooty or black for various reasons. Therefore, please only use our original höfats bioethanol liquid fuel, which burns without soot or odour. SPIN 900 | 1200 | 1500 has been specially tested and approved for use with this fuel – for safe use indoors and outdoors. [To the original höfats liquid bioethanol](https://hofats.com/en/Bioethanol-Liquid-Fuel-1l-Bottle-Six-Pack/00525) Use only warm water and dish soap to clean the glass cylinder. 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