cleaner() {
    if (this.cleanerCache) {
      return this.cleanerCache
    }

    if (this.browsers.selected.length) {
      let empty = new Browsers(this.browsers.data, [])
      this.cleanerCache = new Prefixes(this.data, empty, this.options)
    } else {
      return this
    }

    return this.cleanerCache
  }
Return clone instance to remove all prefixes